Scratch on XO is frozen after standby

[Bert Freudenberg]

This is a long-standing kernel bug. Sleep/resume is supposed to be  
transparent to user-space processes. Could you add your findings to  
the ticket, please?

http://dev.laptop.org/ticket/6201

- Bert -

On 24.12.2008, at 07:43, Philipp Kocher wrote:

> Hi John
>
> Etoys has exactly the same problem (etoys is frozen and the line  
> "snd_pcm_writei returned -86" gets written endlessly into the etoys  
> logfile).
>
> Sorry, I don't know anything about DBus.
>
> To reproduce with Etoys:
> 1. Open etoys on the Xo
> 2. Click on "make A Project"
> 3. Click on "Supplies"
> 4. Drag and drop the "Sound recorder"
> 5. Record a sound
> 6. Play the recording
> 7. Press XO power button (just short so the XO goes in standby mode  
> with dark screen)
> 8. Press XO power button (again just short)
> 9. Etoys is frozen
>
> Scratch:
> We have the frozen Scratch problem very often at the moment because  
> we are using Scratch and record sounds (about 3-5 students of 30 per  
> lesson). It really bad since saving the project is not possible  
> anymore.
>
> First I thought it is because we switched on experimental Power  
> Management. But now it is switched off and the problem is still here.
>
> It is just Scratch that freezes, Sugar is still working fine.
> I don't remember having seen this problem on older sugar builds e.g.  
> 656 or 708 and we used Scratch intensively on this builds.
>
> Regards,
> Philipp
>
> John Maloney wrote:
>> Wow, first I've heard about this problem. I wonder if Etoys has the  
>> same problem?
>> The problem appears to be have something to do with having the ALSA  
>> sound output port open when the XO goes to sleep. This may actually  
>> be an ALSA/sleep issue but it may be easier to work around it than  
>> to fix ALSA.
>> Is there a DBus message or event that says when the machine is  
>> about to go to sleep?
>>    -- John
>> On Dec 23, 2008, at 9:56 PM, Philipp Kocher wrote:
>>> Hi John
>>>
>>> We have a big problem with Scratch version 11 and 12 on the XO  
>>> (build 767).
>>>
>>> After not using the XO for some minutes Scratch freezes completely  
>>> (no drag and drop and no buttons can be pressed anymore). The  
>>> following line gets written in the scratch logfile in an endless  
>>> loop (if scratch doesn't get killed, the logfile uses multiple MB):
>>> snd_pcm_writei returned -86
>>>
>>> The problem can be reproduced easily:
>>> 1. Start Scratch
>>> 2. Record sound and play the sound
>>> 3. Press XO power button (just short so the XO goes in standby  
>>> mode with dark screen)
>>> 4. Press XO power button (again just short)
>>> 5. Scratch is frozen
>>>
>>> Regards,
>>> Philipp
>>> Pepyride School
>>> Cambodia
>>>
>>> PS: Are you using the bug tracking page on dev.laptop.org for XO  
>>> related bugs of Scratch?